Brilliant stainless steel construction with stylish knurled grips and a handy design to keep dust and dirt out, exquisite and practical. Wordlessly train your dog with sound—what sounds like a gentle whistle to humans can be heard by dogs hundreds of yards away. Enjoy training and improve communication with your dog. Adjust the frequency to suit your dog's hearing—find the right pitch and lock it in with the special locking nut. Safe with environmentally friendly food grade stainless steel chain, suitable for dogs of all ages, genders and breeds. Removable chain and key rings offer convenient carry options: in your pocket, with your keys, on a lanyard, a belt loop, or a backpack. Great tool to teach obedience and basic skills. Specification: Material: Copper + stainless steel Size L: Combined whistle length approx. 10cm/3.94inch; without sleeve whistle size approx. 8.7x0.7cm/3.43x0.28inch; chain length approx. 22cm/8.66inch Size S: Combined whistle length approx. 8.5cm/3.35inch; without sleeve whistle size approx. 7x0.7cm/2.76x0.28inch; chain length approx. 15cm/5.91inch Package Includes: 1 Piece dog whistle Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to lighting effects and settings, there could be some slight difference in the color of the pictures and the actual item. Color as shown.